Manufacture of jointless rings.



A. GLBBE.

RE 0F JOINT M AB LLLLLLLLLLLLLLL AB. 11111 1. 1,038,346, Patented Sept.10, 1912.

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UNITED STATES l AUGUST GLE'BE, or rroRznErM, GERMANY.

MANUFACTURE 015 J OINTLESS RINGS.

Specification of Trotters Patent. 7 Patented 10,1912.

Application filed March 8, 1911. Serial No. 613,188.

To all whom it mag concern:

Be it known that I, AUGUST GLEBE, a subject of the German Emperor, andresident of Pforzheim, Germany, have invented certain new and usefulImprovements in the Manufacture of Jointless Rings, of which thefollowing is a specification.

Jointless rings, which are made of sections of rolled seamlesscylindrical bodies, can of course only be made of uniform thickness andcannot on the outside be provided with any plastic decoration, since thepressure on the inner side, which is necessary therefor, can not beexerted. Decorative rings were therefore pressed as flat strips andsoldered at their smooth ends. The soldering joint remains alwaysvisible owing to its color; it lies opposite to the decoration .on theinner side of the hand, where the rings are narrower but also ex posedto frequent pressure. Owing to its brittleness, the soldered joint oftenbreaks. The difference in the cross section could also the thickness ofthe thickest point and filing the remaining circumference off, whichnecessitates work and loss of material. Reliefs on the outside were onlyobtained by making the inside concave, for which purpose a separateprocess and tool were required, and even then the thickness of the metaldid not suflice for certain reliefs. Attempts to provide j ointlessrings with reliefs by shifting the same on a thorn, were unsuccessful,because a soft thorn, which was not thicker than the width of the ring,was bent, and a hard one broken off by the pressure exerted thereon.

The present invention, which is shown on the accompanying drawing in itsdifferent steps of being put into practice, shows'means by which themetal thickness of the circumference can be made so different that onthe one hand the filing-01f is omitted and on the other hand the largerthickness exists at the point where it is required for the decoration,said means allowing further to mount the decoration on a j ointless ringand on as large a part of its circumference as was hitherto possible onflat rings only which were soldered after pressing.

Figures 1 to 6 show the different steps of manufacture of a ring withdifferent size of cross section, while Figs. 7 to 11 represent thedifferent steps of pressing the decoration on the thickest ring partwith the aid of two different devices.

A strip of sheet metal 1 (Fig. 1) is by means of a figured roll soshaped that it receives in its middle between the lines 9-9 a 1 largerthickness than on its sides (see cross section below Fig. 1). From thestrip 1 first by punches the openings 2 are punched f and then thepieces 3 are punched out (Fig. 3 4). For the purpose of punching theopenings 2 as well as the pieces 3 two punches always work at the sametime, one at the left 1 and the other at the right side of the strip.The upper part of said pieces 3 with the projections 12 and 13 above thehorizontal 1 line .(Fig. 4), which corresponds to the line 9--9 in Fig.1, is of larger, and the lower part of smaller, metal thickness. Theflat piece 3 is-now placed in a matrix 5 (Fig. 2) in such a way that theouter projection 12 lies on the right in the recess 6 at the edge of thecavity, while the inner projection 13 lies toward the punch 4 and uponthe descent of the punch rests tightly upon the incline 7 at the lowerend of the same. The descend ing punch imparts now to the flat ringpiece 3 a conical shape (Fig. 5), the broader and thicker part of thesame lying now at the upper side of the conical ring. Thereupon, thering is, with the narrower opening at the top, placed in thedrawing-appliance 11 (Fig. 3), of which the punch 8 is shaped at 10corresponding to the shape of the ring, while it moves as much eccentricwithin the bed 11 as is necessary to suit the diiferent thickness of thering walls. By the ring being forced through the lower cylindricalopening of the bed 11, it receives the cylindrical form shown in Fig. 6,the steps 9-9 having then also disappeared by the two punchingoperations, so that the outer and inner ring circumferences form twoeccentric circles. The broader part of the ring has now the requiredlarger metal thickness.

One of the two apparatuses shown in Figs. 7 toll, serves for pressingthe decorat-ion on. Fig. 7 shows one of the same in a front view, andFig. 8 in a side view. The body 14 has an upper jaw 15 and a lower roundthorn 16 which is parallel thereto. The distance between jaw 15 andthorn 16 is somewhat decreased toward the inside. The templet 17 isafter mounting of the ring on the thorn so clamped between, jaw andthorn by a slight blow that the free end of the thorn finds a supportthereon, which prevents it from breaking off. After each pressure, thetemplet 17 must be removed and after mounting of another ring again bereplaced. The swage belonging thereto is substantially the same as thosehitherto top, while also the bottom end corresponds to a ring of largerdiameter. The lower end of the bung 1S fits exactly the top end of thethorn, so that both lie fiat upon each other. Besides, the bung 18 has alower ringlike groove 21 for the reception of the upper part of thering, which is placed on the thorn. The thorn 19 which on both ends isprovided with pins 20 lies with one of the latter in the fixed jaw 22,while the other pin is locked in position by the cut-away part of themovable jaw 23. The thorn 19 For broader decorations the delies at bothsides of the groove 21 upon the bung 18, where it receives pressureonly, so that a breaking of same is practically impossible. Atter eachoperation, the jaw 22-3 is brought into the dotted position (Fig. 10)the thorn 19 lowered, and the ring rcmoved. The ring is then shifted ona round thorn and by heating with a wooden hammer brought into its finalshape. The

. cross section of the thorn 19 is changed according to the width ofring and the desired size of decoration.

I claim:

In the manufacture of jointless metal rings, forming a sheet metal stripof larger thickness in its middle than on its sides,

punching flat ring pieces each having an outer and an inner projectionout of said metal strip, the thicker part of each fiat ring piece lyingsymmetrically on that side containing the outer projection, stamping aconical ring from said fiat ring piece, and finally a cylindrical ringfrom said conical ring.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

AUGUST GLEBE.

\Vitnesses A. O. TITTMANN, S. H. SHANK.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

' Washington, I). G.

